Imagine you're at the prom when things suddenly start to turn up and get wild after everyone finds out that Justin Bieber is in the house!
That's what happened to some lucky high school kids from Chatsworth, Los Angeles when the Biebs crashed their prom and "YOLO'd" with the partying students!
Of course, Justin sneaked in a dance with the school's Prom Queen!
Now that's how to crash a prom, Bieber style!
What would you do if Justin Bieber crashed your prom? Tell us your thoughts in the comments section!